← Glossary Morphology petiole The stalk that connects a leaf blade to the stem. Leaves without petioles are called sessile . Plants Using This Term (7) Alliaria petiolata — Garlic Mustard Anubias barteri — Anubias Convallaria majalis — Lily of the Valley Prunus virginiana — Chokecherry Rhamnus cathartica — Common Buckthorn Toxicodendron pubescens — Atlantic Poison Oak Viola sororia — Common Blue Violet Related Terms achene acuminate alternate annual axillary basal berry biennial bract calyx capsule cauline clasping cordate corolla crenate cyme cypsela deciduous dentate drupe entire evergreen glaucous inflorescence lanceolate ligulate lobed opposite ovary palmate panicle pappus pedicel perennial pinnate pubescent raceme rachis rhizome rosette sepal serrate sessile silique spadix spathe spatulate stamen succulent taproot ternate thallus trifoliate umbel undulate whorled